I have a Cub from The World Models. It's about 3 years old and fly's great on a 17 year old O,S, 40 FP a O,S, 46 will really pull it around. One problem with mine was the pins in the fuselage for the wing mount were aluminum and after several flights they vibrated loose fell out and the wing having no forward support lifted up until it broke off the fuselage. Much to my surprise the only damage was the struts from wing to fuse were broken / the wing hold down bolt locations torn out of the wing. The fuselage was so lite that when it hit "mud" the cowl was broke and no other damage was done. I did my repairs and replaced the aluminum pins with epoxied in 1/4" dowels. Hope this is of some help.